Fixed an issue when application crashed in proxy mode after a failure

Author: krlvm

app/src/main/java/io/github/krlvm/powertunnel/android/managers/ProxyManager.java

@@ -146,6 +146,7 @@ public void stop(boolean graceful) {
             Log.w(LOG_TAG, "Attempted to stop server when it is not running");
             return;
         }
+        if (!this.server.isRunning()) return;
 
         new Thread(() -> {
             Log.i(LOG_TAG, "Stopping server...");

app/src/main/java/io/github/krlvm/powertunnel/android/services/ProxyService.java

@@ -77,6 +77,7 @@ public int onStartCommand(Intent intent, int flags, int startId) {
                             .putExtra(PowerTunnelService.EXTRAS_MODE, TunnelMode.PROXY)
                             .putExtra(PowerTunnelService.EXTRAS_ERROR, error)
                     );
+                    stopSelf();
                 },
                 TunnelingVpnService.getDefaultDNS(this)
         );